Reprinted from: http://my.oschina.net/u/573270/blog/423238
On November 13, 2014, US time, the PHP development team, in "PHP 5.6.3 is available|PHP: Hypertext Preprocessor "The latest version of the PHP5.6 series "PHP 5.6.3" was announced.
In the latest version 5.6.3, not only multiple bugs have been corrected, but also security vulnerabilities in the fileinfo module have been corrected.
The PHP team recommends users using the PHP5.6 series to upgrade to the latest version 5.6.3.
A brief introduction on how to install PHP5.6 on CentOS.
Configure yum source
Add CentOS 6.x epel and remi sources.rpm -Uvh http://ftp.iij.ad.jp/pub/linux/fedora/epel/6/x86_64/epel-release-6-8.noarch.rpm rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-6.rpm
The following is the source for CentOS 7.0.
yum install epel-release rpm -ivh http://rpms.famillecollet.com/enterprise/remi-release-7.rpm
Use the yum list command to view the installable packages (Packege).
yum list --enablerepo=remi --enablerepo=remi-php56 | grep php
Install PHP5.6
The yum source is configured, the next step is to install PHP5.6.
yum install --enablerepo=remi --enablerepo=remi-php56 php php-opcache php-devel php-mbstring php-mcrypt php-mysqlnd php-phpunit-PHPUnit php-pecl-xdebug php-pecl-xhprof
Use PHP command to check the version.
php --version PHP 5.6.17 (cli) (built: Jan 6 2016 19:05:40) Copyright (c) 1997-2015 The PHP Group Zend Engine v2.6.0, Copyright (c) 1998-2015 Zend Technologies with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2015, by Zend Technologies with Xdebug v2.3.3, Copyright (c) 2002-2015, by Derick Rethans
The version installed here is PHP5.6.0. Careful users may have discovered that ZendGuardLoader has become Zend OPcahe.
Starting from PHP5.5, the PHP code cache has changed from APC to Zend OPcache.
The above introduces the installation of php 56 under centos. The test methods are available, including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。


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